A009818 - OEIS

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A009818

Expansion of tanh(tan(x)/cos(x)).

1, 3, -23, -2149, -73967, 4773747, 1496400505, 166245767819, -17997337551071, -15656779903415325, -4002361029690394103, 437839261718446458491, 1025307746504958768359473, 499247007876089430591206739 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MATHEMATICA	`Tanh[ Tan[ x ]/Cos[ x ] ] (* Odd Part *)`
	CROSSREFS	`Sequence in context: A144986 A088056 A009593 * A166315 A113577 A204578` `Adjacent sequences: A009815 A009816 A009817 * A009819 A009820 A009821`
	KEYWORD	`sign`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net)`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`

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Last modified February 16 16:00 EST 2012. Contains 205938 sequences.